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internet access with ping has 100% loss

I have at home the following setup:
Internet - NAS (Ubuntu 16.04.4 LTS) - LAN (Asus N56U wireless router) - family users
NAS connects using pppoe (ppp0, UTP cable) to Internet while having eth0 (192.168.0.1, UTP cable) for LAN.
Asus N56U connects to NAS using static ip 192.168.0.2 with DNS 192.168.0.1.
Everything works fine: NAS (cable) and family users (WiFi) access the Internet.
I use the same setup with Asus RT-AC66U and simply doesn't work .
In order to troubleshoot this I run on NAS (108.177.119.94 is google):